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What Causes an Automatic Transmission to Not Move When Shifted?

2 Answers

McRichard

09/03/25 5:33am

There are several reasons why an automatic transmission may not move when shifted, including a loose linkage between the shift lever and the manual valve rocker arm, a clogged oil pump intake screen, severe leakage in the main oil passage, or a damaged oil pump. Below are the troubleshooting steps for an automatic transmission that does not move when shifted: Loose linkage between the shift lever and the manual valve rocker arm: Check whether the linkage or cable between the automatic transmission shift lever and the manual valve rocker arm is loose. If it is loose, reattach it and readjust the position of the shift lever. Clogged oil pump intake screen: If only a small amount of hydraulic oil flows out of the main oil passage pressure test port and the oil pressure is very low or almost nonexistent, open the oil pan and check whether the oil pump intake screen is clogged. If it is not clogged, the oil pump may be damaged or there may be severe leakage in the main oil passage, requiring disassembly and inspection of the automatic transmission. Severe leakage in the main oil passage: Remove the plug from the main oil passage pressure test port, start the engine, shift the lever to the drive or reverse position, and check whether hydraulic oil flows out of the test port. Damaged oil pump: If there is some oil pressure in the main oil passage during a cold start but the pressure drops significantly when the engine is warm, the oil pump may be excessively worn and should be replaced.

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Rosa

09/15/25 7:02am

I've thought about this issue of automatic transmission not moving after shifting gears quite a few times. It could be due to insufficient or dirty transmission fluid, where low oil pressure causes the gears to get stuck. The braking system is another critical point - if the electronic parking brake isn't fully released or the mechanical brakes are jammed, the car won't move. Another major problem could be engine or sensor failure, such as a faulty crankshaft position sensor preventing power from reaching the wheels. Internal transmission issues like valve body sticking or clutch wear could also be the cause. I once encountered this problem which was solved simply by changing old transmission fluid. Safety is crucial here - if the car doesn't respond after shifting upon startup, immediately turn off the engine for troubleshooting rather than forcing it to move. Regular maintenance like transmission fluid changes and brake inspections can prevent such issues. Developing the habit of checking all systems before starting helps avoid roadside troubles.

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